GEOL 1001 Chapter : Chapter 4 Geology Final Exam Review
Document Summary
***melted rock can cool above or below ground. ***some igneous rocks solidify at the surface during an eruption. ***most igneous rocks are made from the solidification of melt underground. ***all oceanic crust is made of igneous rock and most continental crust is made of igneous rock. ***magma forms in special settings that melt existing rocks. ***melting is caused by pressure release, volatile addition, and heat transfer. ***decompressional melting is when pressure drops when hot rock rises to shallower depths; occurs if the pressure affecting hot mantle rock decreases while the temperature remains unchanged, magma forms. ***magma forms where volatiles mix with hot mantle rock. ***subduction introduces water to the mantle, melting rock. ***flux melting is the melting due to the addition of volatiles. ***as magma rises from the mantle into the crust, it brings heat with it; it raises the temperature of the surrounding crustal rock- can lead to partial melting of the crustal rock.
